public OutMessage(Chat chat, List<Contact> contacts, MessageContent content, boolean encrypted) { super( chat, "Kon_" + EncodingUtils.randomString(8), content, Optional.empty(), Status.PENDING, encrypted ? CoderStatus.createToEncrypt() : CoderStatus.createInsecure()); Set<Transmission> ts = new HashSet<>(); contacts.forEach( contact -> { boolean succ = ts.add(new Transmission(contact, contact.getJID(), mID)); if (!succ) LOGGER.warning("duplicate contact: " + contact); }); mTransmissions = Collections.unmodifiableSet(ts); }